I rooted my phone now it won't turn on. What can I do?

im pretty sure my phone is bricked. i have a tmobile galaxy note 5. i downloaded a kernal and then rooted the phone, still able to get it into the downloading mode and boot screen, but if i try to boot my phone it freezes at the startup.. not sure what to do. ive tried downloading the original firmware and it fails when i try to install it with odin. any suggestions?